Hello everyone,
I wanted to try the scheme Broskie, and I used the original opamp drive just by connecting pin 1,2,3,14,15,without RC, and 8,9,11,16 for the 5 v. -- 5v. the others are disconnected,I tried with and without resistor from Vref to ground. For the tube, it is 168v. at the anode,-3.1V. to the grid, and 2.1 V. the cathode.
There's sound, putting the volume up, but it is very very low.
What could be the problem? Someone has already tried this scheme?
Thank you
Best Regards
Stefano